Alternating-current electromagnet.



D. L. LINDQ UISI. ALTBRNATING CURRENT ELEQTROMAGNET.

APPLICATION FILED FEB. 6, 1913.

1,066,294, Patented July 1, 1-913.

- m wi/tmeooe o v 8 W00 nkyc In Figs. 1, 2 and 3, the flanged tube or spool r ts tr Annuals s 4 with 'DAVID L. LII JZGQUIST, G F YQNKERS, YORK.

ALTEENATING-CURRENT ELECTRQEIIfiGNET.

specification cf Lcttei's Eatent.

Patented J i,

Application filed February 5,1913. Serial No. 748,443.

To aZZ whom it may concern:

Be it known that 1, DAVID L. Liiznonisr, a subject of the King of Sweden, residing at Yonkers, in the county of Westchtster and State of New York, have invented a certain new and useful lniprm'einent in Alternating-Current Electromagnets, of which the following is a specification.

The invention relates to an alternating current electro-inagnet, of the general type disclosed in U. S. Letters Patent No. T l-$773. granted to me November 2 1, 1903, an more particularly to the specific type disclosed in U. S. Letters Patent Nos. 1,005,855 and 1,005,856, granted to me October 17, 1911, wherein the core carries a secondary conductor or secondary conductors, in which is induced a. current of (liil'erent phase from that energizing the primary. As set forth in the aforesaid Letters Patent, such an alternating current magnet w l hold its mov- 111;; member firmly in attracted position Without vibration or chatterinp My present in ent-ion consists in the construction wherein the primary and secondary conductors are both stationery. The secondary conductor, in the form of a U- shaped plate, is secured within the primary coil, and enters recesses in the polar extremities of the parts of the core. Either of said parts, or both of them, may he movable.

In the accompanying drawings-ligure 1 is a. vertical section of my elect-ro-inegnet on the line :0, m of Fig. Fig. 2 is e vertical section on the line 7 yet Fig. 1. Fig. 3 is a horizontal section on the line 2, z of Fig. Fig.4 is a horizontal section of 21- niodified form of the device in which the spool and secondary conductor are-made integral. Fig. 5 is a vertical section of said spool and secondary conductor.

Similar letters of reference indicate like parts.

A is the primary coil, and B the casing.

C, on which the coil A is Wound, is of nonconductiiig material, and has Within it the- U-sheped secondary conductor D, the-cross bar of which is curved to fit ag'amst the 1nner periphery of SEtlCl spool and. is attached G are received in recesses H and I made thereto by any suitable means, such screws E. Said conductor is placed at about the mioclle of the spool, and its arms respectiycly in the polar feces of the core members K, L. Either of aid core Incinhers may he fixed in the spool and the other left movable to constitute the armature, or both may he movable. The secondary circuit, which includes the Usheped concluctoi l is here completed by the Wire M which is attached to the ends of the arms thereof, and which includes a. resistenceN which may be variable. ll hen the primary coil is energized by elternetinfi current, the moving member is, or the moving members of the core ere, drawn into contact Within the spool. A current of diii'erent phase induced in the secondary circuit. Hence tie current inagnetizingthe core never falls to Zero, and the ermat tne arniatures are held in contact Without vihrzn tion or chattering.

In the modification shown in Figs-4 end'i e 5, the spool {l is of co per or other high. conducting material, and the U-shoped piste D may be cast or otherwise made into; l therewith. Between the points of junction of the arms of plate D and the spool hotly. 86 the spool is split longitudinally, es SllGWl *1 O, and the Wire including the resistance h is attached to the spool flanges The object of the resistance N is to 30 of phase adjustment of the displaced. rents.

I claim:

1. An alternating current electromagn toI the type set forth, comprising a pi" coil, a fixed secondary conductor discos Within said coil, and a movable laminated core having in its polar end longitudinsl recesses receiving said secondary conductor.

2. in alternating current electro-megnet of the type set forth, coinpris coil, 21 fixed secondary conductor disposed Within seid coil, and two laminated cores having in their opposing polar ends recesses receivingseid secondary conductor.

3. Analternating current electro-niegnct of the type set forth, comprising a primary coil, 2. fixed secondeify conductor disposed cured to said shew e means fer dosing the 2 l oeeeee Within said coil, and two movable laminated cores having in their opposing polar ends recesses receiving said secondary conductor 1 4. A11 alternating currrent electro-magnei of the type set ferth, comprising a primary coil, atubular sleeve therein, a i -shaped;

tremity receiving said arms.

in testlmony whereof I have affixed my signature 1n presence of two wltnesses,

DAV L. LETJJDQUIST.

plate of material of high conductivity sesecondary circuit ihrough said pixie, and an Copies 0: this patent may be obtained for five cents eaeh, by addressing we Gammissioner of Patents, Washington, D C.

armature having recesses in. its polar 1 

